Dollaseite-(Ce) Mineral Data

General Dollaseite-(Ce) Information

Chemical Formula:

CaCeMg2AlSi3O11(OH,F)2

Composition:

Molecular Weight = 551.04 gm

Calcium 7.27 % Ca 10.18 % CaO

Cerium 25.43 % Ce 29.78 % Ce₂O₃

Magnesium 8.82 % Mg 14.63 % MgO

Aluminum 4.90 % Al 9.25 % Al₂O₃

Silicon 15.29 % Si 32.71 % SiO₂

Hydrogen 0.27 % H 2.45 % H₂O

Oxygen 36.29 % O

Fluorine 1.72 % F 1.72 % F

- % F -0.73 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaCeMg₂AlSi₃O₁₁(OH)_1.5F_0.5

Environment:

Metamorphic mineral with tremolite, norbergite and calcite.

IMA Status:

Approved IMA 1988 - Dana Number Modified from 58.2.1a.6

Locality:

Ostanmossa mine, Norberg district, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Wayne A. Dollase (1938-?), American mineralogist, University of California at Los Angeles.

Name Pronunciation:

Dollaseite-(Ce) + Pronunciation

Synonym:

ICSD 202605

Magnesium orthite

PDF 41-1469

Dollaseite-(Ce) Image

Images:

Dollaseite-(Ce)

Comments: Glassy brown crystalline grains of dollaseite-(Ce) in matrix.
Location: Ostanmossagruvan, Norberg, Sweden. Scale: Grain size 1 mm.
© Tom Loomis / Dakota Matrix

Dollaseite-(Ce) Crystallography

Axial Ratios:

a:b:c =1.5616:1:1.7787

Cell Dimensions:

a = 8.934, b = 5.721, c = 10.176, Z = 2; beta = 114.31° V = 473.99 Den(Calc)= 3.86

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.915(1), 2.709(0.7), 2.852(0.3),

Physical Properties of Dollaseite-(Ce)

Cleavage:

{???} Indistinct

Color:

Brown.

Diaphaneity:

Translucent

Hardness:

6.5-7 - Pyrite-Quartz

Luster:

Vitreous (Glassy)

Streak:

light brown

Optical Properties of Dollaseite-(Ce)

Gladstone-Dale:

CI calc= 0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.187,KC= 0.1899
Ncalc = 1.73

Optical Data:

Biaxial (?), a=1.715, b=1.718, g=1.733, bire=0.0180

Calculated Properties of Dollaseite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.68 gm/cc
note: Specific Gravity of Dollaseite-(Ce) =3.86 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Dollaseite-(Ce)}= 124.89 barns/electron
U=PE_{Dollaseite-(Ce)} x r_electron= 460.17 barns/cc.

Radioactivity:

GRapi = 25,889.59 (Gamma Ray American Petroleum Institute Units)
Concentration of Dollaseite-(Ce) per GRapi unit = 38.63 (PPM)

Dollaseite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Dollaseite-(Ce)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.91 cm	569,568	1.54E-05	25,889.59	8.51
100 gm / 3.67 cm	56,957	1.54E-06	2,588.96	0.85
10 gm / 1.70 cm	5,696	1.54E-07	258.90	0.09
1 gm / 7.91 mm	570	1.54E-08	25.89	0.01
0.1 gm / 3.67 mm	57	1.54E-09	2.59	0.00
0.01 gm / 1.70 mm	6	1.54E-10	0.26	0.00
0.001 gm / 0.79 mm	1	1.54E-11	0.03	0.00

Weight of pure Dollaseite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.86 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 1.27 % Th) From Sum REE Elements (25.43 % REE)

Dollaseite-(Ce) Classification

Dana Class:

58.02.01d.01 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)

(58.02.01d)Epidote group (Dollaseite subgroup)

58.02.01d.01 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 2₁/m 2/m

58.02.01d.02 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 2₁/m 2/m

Strunz Class:

09.BG.05c 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;

09.BG.05c Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 2₁/m 2/m

09.BG.05c Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 2₁/m 2/m

Other Dollaseite-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.73,p838-842,1988) OPTIC PROP.(Am.Min.,Vol.73,p838-842,1988)

See Also:

Links to other databases for Dollaseite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Print or Cut-and-Paste your Dollaseite-(Ce) Specimen Label here :

Dollaseite-(Ce)

CaCeMg2AlSi3O11(OH,F)2
Dana No: 58.02.01d.01 Strunz No: 09.BG.05c
Locality:

Notes:

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